Mercurial > hg > truffle
annotate src/share/vm/utilities/sizes.hpp @ 14162:ab1c093f15c2
added unit test to ensure all classes in graal.jar comply with select global invariants
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 12 Mar 2014 21:50:50 +0100 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_SIZES_HPP |
26 #define SHARE_VM_UTILITIES_SIZES_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "utilities/globalDefinitions.hpp" | |
30 | |
0 | 31 // The following two classes are used to represent 'sizes' and 'offsets' in the VM; |
32 // they serve as 'unit' types. ByteSize is used for sizes measured in bytes, while | |
33 // WordSize is used for sizes measured in machine words (i.e., 32bit or 64bit words | |
34 // depending on platform). | |
35 // | |
36 // The classes are defined with friend functions operating on them instead of member | |
37 // functions so that they (the classes) can be re-#define'd to int types in optimized | |
38 // mode. This allows full type checking and maximum safety in debug mode, and full | |
39 // optimizations (constant folding) and zero overhead (time and space wise) in the | |
40 // optimized build (some compilers do not optimize one-element value classes but | |
41 // instead create an object in memory - thus the overhead may be significant). | |
42 // | |
43 // Note: 1) DO NOT add new overloaded friend functions that do not have a unique function | |
44 // function name but require signature types for resolution. This will not work | |
45 // in optimized mode as both, ByteSize and WordSize are mapped to the same type | |
46 // and thus the distinction would not be possible anymore (=> compiler errors). | |
47 // | |
48 // 2) DO NOT add non-static member functions as they cannot be mapped so something | |
49 // compilable in the optimized build. Static member functions could be added | |
50 // but require a corresponding class definition in the optimized build. | |
51 // | |
52 // These classes should help doing a transition from (currently) word-size based offsets | |
53 // to byte-size based offsets in the VM (this will be important if we desire to pack | |
54 // objects more densely in the VM for 64bit machines). Such a transition should proceed | |
55 // in two steps to minimize the risk of introducing hard-to-find bugs: | |
56 // | |
57 // a) first transition the whole VM into a form where all sizes are strongly typed | |
58 // b) change all WordSize's to ByteSize's where desired and fix the compilation errors | |
59 | |
60 | |
61 #ifdef ASSERT | |
62 | |
63 class ByteSize VALUE_OBJ_CLASS_SPEC { | |
64 private: | |
65 int _size; | |
66 | |
67 // Note: This constructor must be private to avoid implicit conversions! | |
68 ByteSize(int size) { _size = size; } | |
69 | |
70 public: | |
71 // constructors | |
72 inline friend ByteSize in_ByteSize(int size); | |
73 | |
74 // accessors | |
75 inline friend int in_bytes(ByteSize x); | |
76 | |
77 // operators | |
78 friend ByteSize operator + (ByteSize x, ByteSize y) { return ByteSize(in_bytes(x) + in_bytes(y)); } | |
79 friend ByteSize operator - (ByteSize x, ByteSize y) { return ByteSize(in_bytes(x) - in_bytes(y)); } | |
80 friend ByteSize operator * (ByteSize x, int y) { return ByteSize(in_bytes(x) * y ); } | |
81 | |
82 // comparison | |
83 friend bool operator == (ByteSize x, ByteSize y) { return in_bytes(x) == in_bytes(y); } | |
84 friend bool operator != (ByteSize x, ByteSize y) { return in_bytes(x) != in_bytes(y); } | |
85 friend bool operator < (ByteSize x, ByteSize y) { return in_bytes(x) < in_bytes(y); } | |
86 friend bool operator <= (ByteSize x, ByteSize y) { return in_bytes(x) <= in_bytes(y); } | |
87 friend bool operator > (ByteSize x, ByteSize y) { return in_bytes(x) > in_bytes(y); } | |
88 friend bool operator >= (ByteSize x, ByteSize y) { return in_bytes(x) >= in_bytes(y); } | |
89 }; | |
90 | |
91 inline ByteSize in_ByteSize(int size) { return ByteSize(size); } | |
92 inline int in_bytes(ByteSize x) { return x._size; } | |
93 | |
94 | |
95 class WordSize VALUE_OBJ_CLASS_SPEC { | |
96 private: | |
97 int _size; | |
98 | |
99 // Note: This constructor must be private to avoid implicit conversions! | |
100 WordSize(int size) { _size = size; } | |
101 | |
102 public: | |
103 // constructors | |
104 inline friend WordSize in_WordSize(int size); | |
105 | |
106 // accessors | |
107 inline friend int in_words(WordSize x); | |
108 | |
109 // operators | |
110 friend WordSize operator + (WordSize x, WordSize y) { return WordSize(in_words(x) + in_words(y)); } | |
111 friend WordSize operator - (WordSize x, WordSize y) { return WordSize(in_words(x) - in_words(y)); } | |
112 friend WordSize operator * (WordSize x, int y) { return WordSize(in_words(x) * y ); } | |
113 | |
114 // comparison | |
115 friend bool operator == (WordSize x, WordSize y) { return in_words(x) == in_words(y); } | |
116 friend bool operator != (WordSize x, WordSize y) { return in_words(x) != in_words(y); } | |
117 friend bool operator < (WordSize x, WordSize y) { return in_words(x) < in_words(y); } | |
118 friend bool operator <= (WordSize x, WordSize y) { return in_words(x) <= in_words(y); } | |
119 friend bool operator > (WordSize x, WordSize y) { return in_words(x) > in_words(y); } | |
120 friend bool operator >= (WordSize x, WordSize y) { return in_words(x) >= in_words(y); } | |
121 }; | |
122 | |
123 inline WordSize in_WordSize(int size) { return WordSize(size); } | |
124 inline int in_words(WordSize x) { return x._size; } | |
125 | |
126 | |
127 #else // ASSERT | |
128 | |
129 // The following definitions must match the corresponding friend declarations | |
130 // in the Byte/WordSize classes if they are typedef'ed to be int. This will | |
131 // be the case in optimized mode to ensure zero overhead for these types. | |
132 // | |
133 // Note: If a compiler does not inline these function calls away, one may | |
134 // want to use #define's to make sure full optimization (constant | |
135 // folding in particular) is possible. | |
136 | |
137 typedef int ByteSize; | |
138 inline ByteSize in_ByteSize(int size) { return size; } | |
139 inline int in_bytes (ByteSize x) { return x; } | |
140 | |
141 typedef int WordSize; | |
142 inline WordSize in_WordSize(int size) { return size; } | |
143 inline int in_words (WordSize x) { return x; } | |
144 | |
145 #endif // ASSERT | |
146 | |
147 | |
148 // Use the following #define to get C++ field member offsets | |
149 | |
150 #define byte_offset_of(klass,field) in_ByteSize((int)offset_of(klass, field)) | |
1972 | 151 |
152 #endif // SHARE_VM_UTILITIES_SIZES_HPP |